Driving the microdisk by photothermal-effect ( 1st report) - excitation of standing wave and traveling wave on a microdisk

Photothermal-effect is lhe method to get driving force due to the thermal stress by temperature gradient that changes light to heat. Micro-cantilever is the simplest elements of micromachine that is driven by using modulated laser diode (output 10μw). Frequency response characteristics and deflection of a micro-cantilever are measured. Applying the principle of photothermal driving of the micro-cantilever, standing wave is excited on the micro-disk. Frequency response characteristics, modal analysis and amplitude of the micro-disk are measured. The micro-disk is made of copper which diameter is 10mm and thickness is 80μm. Standing wave of mode shape No. 2 and mode shape No. 3 is excited on the micro-disk. Traveling wave is excited on the micro-disk by using plural lasers. Traveling wave is excited on a micro-disk by using two modulated laser diodes. Amplitude of traveling wave and phase difference are measured. The traveling wave of mode shape No 3 is generated on the micro-disk and maximum amplitude is 0.26 μ m.